Layer 3 Routing Commands
1445
configuration for the destination UDP port. If so, the relay agent unicasts the
packet to the configured server IP addresses. Otherwise the packet is not
relayed.
The relay agent only relays packets that meet the following conditions:
• The destination MAC address must be the all-ones broadcast address
(FF:FF:FF:FF:FF:FF).
• The destination IP address must be the IPv4 broadcast address
(255.255.255.255) or a directed broadcast address for the receiving
interface.
• The IP time-to-live (TTL) must be greater than 1.
• The protocol field in the IP header must be UDP (17).
• The destination UDP port must match a configured relay entry or an entry
DHCP relay cannot be independently enabled or disabled globally. Only IP
helper can be enabled or disabled globally. Enabling IP helper enables DHCP
relay.
Commands in this Section
This section explains the following commands:
ip helper-address (global configuration)
ip helper-address (interface configuration)
ip dhcp relay information check
ip dhcp relay information check-reply
ip dhcp relay information option
ip dhcp relay information option-insert
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